#include<algorithm>
#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
inline int read() {
int x = 0, f = 1;
char ch = getchar();
while (ch < '0' || ch > '9') {
if (ch == '-')f = -1;
ch = getchar();
}
while (ch >= '0' && ch <= '9') {
x = x * 10 + ch - '0';
ch = getchar();
}
return x*f;
}
struct edge {
int x, y;
double v;
} e[1000001];
int n, k, cnt, tot, ......
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